Understanding the process of soil organic carbon (SOC) sequestration and mineralization in aggregates is pertinent to mitigate climate change and minimize risks of soil degradation. Thus, soil samples were obtained after a 10-year field experiment to identify the influences of tillage on aggregate-associated SOC sequestration and mineralization in the North China Plain (NCP). Four tillage practices investigated were as follows: no-till with straw retention (NTS, conservation tillage), rotary tillage with straw incorporation (RTS), conventional tillage with straw incorporation (CTS), and conventional tillage with straw removal (CT). Significantly negative correlations were observed between SOC concentration and potentially mineralized carbon in aggregates under different treatments for the 0–10 cm soil layer. The large macro-aggregates (>2 mm) with the highest proportion of size distribution represented the major pool of SOC stock (47.3–51.2%) and mineralization amount (38.2–43.6%) in the 0–30 cm layer, followed by that in the small macro-aggregates (0.25–2 mm), regardless of tillage practices. However, the mineralization quotient (mineralization per unit SOC concentration) of macro-aggregates (>0.25 mm) was lower than that for the other size classes. The NTS enhanced the macro-aggregate formation in the 0–20 cm layer and associated SOC concentration in the 0–10 cm layer. Furthermore, NTS decreased total potential mineralization in the 0–30 cm layer compared with the other tillage practices, attributed to decrease in the large macro-aggregates (30.0–51.4%) with low particulate organic carbon (POC) concentration. The NTS with low straw inputs had higher incremental efficiency with straw incorporation than that in the RTS and CTS by 45.0% and 13.5%, respectively (P < 0.05). Overall, the higher proportion of macro-aggregates recorded under NTS decreased carbon mineralization, and consequently, increased incremental efficiency with straw incorporation, and improved SOC sequestration in the surface soil layer in the NCP.

了解骨料中有机碳的固存和矿化过程与缓解气候变化和最大程度降低土壤退化的风险有关。因此，经过10年的田间试验，获得了土壤样本，以确定耕作对华北平原（NCP）骨料相关的SOC固结和矿化的影响。研究了以下四种耕作方式：保留秸秆的免耕耕作法（NTS，保护性耕作），掺入秸秆的旋耕耕作法（RTS），掺入秸秆的传统耕作耕作法（CTS）和去除秸秆的传统耕作耕作法（CT）。在0-10 cm土层下，不同处理下，SOC浓度与集料中潜在矿化碳之间存在显着负相关。大型宏观集合（> 尺寸分布比例最高的2 mm）代表了0-30 cm层中的主要SOC储量（47.3–51.2％）和矿化量（38.2–43.6％），其次是小的宏观聚集体（ 0.25–2 mm），无论耕作方式如何。但是，大型骨料（> 0.25 mm）的矿化商（每单位SOC浓度的矿化）低于其他尺寸类别。NTS增强了0-20 cm层中宏观聚集体的形成，并增强了0-10 cm层中相关的SOC浓度。此外，与其他耕作方式相比，NTS减少了0-30 cm层中总潜在矿化作用，这归因于大型宏观聚集体（30.0–51.4％）的降低和低颗粒有机碳（POC）浓度的降低。P  <0.05）。总体而言，NTS记录下的较大聚集体比例较高，减少了碳矿化作用，因此，通过秸秆掺入提高了增量效率，并改善了NCP表层土壤中的SOC隔离。